Abstract:The effect of blasting vibration on a new tunnel adjacent to existing tunnel and its control technology are the key issues of tunnel project. Since the new tunnel is close to existing tunnel,the seismic wave- induced by blasting endangers the safety and stabilization of surrounding rock and lining of existing tunnel. For different tunnel spacing distances,different types of surrounding rocks and safety explosive charge adopted in project are in need of determination. On the basis of the simulation with the dynamic FEM,the effects of blasting vibration on the surrounding rock and lining structure of adjacent existing tunnel with different types of surrounding rocks,tunnel spacing distances,rock mass damping ratios,explosive quantity circumstances are studied combining with mutual influences of blasting on left bank tunnels project construction of Jinping I Hydropower Station. According to the velocity of tunnel lining vibration and lining dynamic tensile stress caused by adjacent tunnel blasting vibration,the minimum spacing distance and explosive charge of blasting construction tunnels with surrounding rock grade III are obtained. When tunnel spacing distance varies from 1.5D to 2.0D,the explosive charge should be controlled less than 15 kg;for surrounding rock grade IV with the tunnel spacing distance 1.5D–2.0D,the explosive charge should be less than 12 kg;for surrounding rock grade V with tunnel spacing distance 1.0D–1.5D,the explosive charge should be less than 10 kg. The achieved results can provide the references and analytical analysis to the construction and design of practical project.